Nutrient scarcity strengthens soil fauna control over leaf litter decomposition in tropical rainforests

Peguero Guille, Sardans Jordi, Asensio Dolores, Fernández-Martínez Marcos, Gargallo-Garriga Albert, Grau Oriol, LLusià Joan, Margalef Olga, Márquez Laura, Ogaya Romà, Urbina Ifigenia, Courtois Elodie A., Stahl Clément, Van Langenhove Leandro, Verryckt Lore T., Richter Andreas, Janssens Ivan A., Peñuelas Josep. 2019. Nutrient scarcity strengthens soil fauna control over leaf litter decomposition in tropical rainforests. Proceedings of the Royal Society B: Biological Sciences, 286 (1910):20191300, 9 p.

Url - jeu de données - Entrepôt autre : https://doi.org/10.5061/dryad.r2r5964

Quartile : Q1, Sujet : BIOLOGY / Quartile : Q1, Sujet : ECOLOGY / Quartile : Q1, Sujet : EVOLUTIONARY BIOLOGY

Liste HCERES des revues (en SHS) : oui

Thème(s) HCERES des revues (en SHS) : Psychologie-éthologie-ergonomie

Résumé : Soil fauna is a key control of the decomposition rate of leaf litter, yet its interactions with litter quality and the soil environment remain elusive. We conducted a litter decomposition experiment across different topographic levels within the landscape replicated in two rainforest sites providing natural gradients in soil fertility to test the hypothesis that low nutrient availability in litter and soil increases the strength of fauna control over litter decomposition. We crossed these data with a large dataset of 44 variables characterizing the biotic and abiotic microenvironment of each sampling point and found that microbe-driven carbon (C) and nitrogen (N) losses from leaf litter were 10.1 and 17.9% lower, respectively, in the nutrient-poorest site, but this among-site difference was equalized when meso- and macrofauna had access to the litterbags. Further, on average, soil fauna enhanced the rate of litter decomposition by 22.6%, and this contribution consistently increased as nutrient availability in the microenvironment declined. Our results indicate that nutrient scarcity increases the importance of soil fauna on C and N cycling in tropical rainforests. Further, soil fauna is able to equalize differences in microbial decomposition potential, thus buffering to a remarkable extent nutrient shortages at an ecosystem level.

Mots-clés Agrovoc : forêt tropicale humide, faune du sol, litière végétale, faune, substance nutritive, activité enzymatique

Mots-clés géographiques Agrovoc : France, Guyane française

Mots-clés libres : Biogeochemistry, Extracellular enzyme activity, Litter decomposition, Nutrients, Soil fauna

Agences de financement européennes : European Research Council

Agences de financement hors UE : Agence Nationale de la Recherche

Projets sur financement : (EU) Effects of phosphorus limitations on Life, Earth system and Society, (FRA) CEnter of the study of Biodiversity in Amazonia, (FRA) ANAEE-Services

Auteurs et affiliations

• Peguero Guille, University of Antwerp (BEL) - auteur correspondant
• Sardans Jordi, CREAF (ESP)
• Asensio Dolores, CREAF (ESP)
• Fernández-Martínez Marcos, University of Antwerp (BEL)
• Gargallo-Garriga Albert, CREAF (ESP)
• Grau Oriol, CIRAD-ES-UMR Ecofog (GUF)
• LLusià Joan, CREAF (ESP)
• Margalef Olga, CREAF (ESP)
• Márquez Laura, CREAF (ESP)
• Ogaya Romà, CREAF (ESP)
• Urbina Ifigenia, CREAF (ESP)
• Courtois Elodie A., Université de Guyane (GUF)
• Stahl Clément, INRA (GUF)
• Van Langenhove Leandro, University of Antwerp (BEL)
• Verryckt Lore T., University of Antwerp (BEL)
• Richter Andreas, University of Vienna (AUT)
• Janssens Ivan A., University of Antwerp (BEL)
• Peñuelas Josep, CREAF (ESP)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/608141/)

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